feat(charts): GeckoTerminal chart with the native chart as fallback

[Vasanthdev2004]

Part 6 of 9 of the UI overhaul, stacked on #61. Each PR's diff is only its own step; review and merge in order.

The token page shows GeckoTerminal's chart once it has indexed the pool, and our own chart until then.

What changes

• The chart-provider route answers which chart to show; the pool lookup is cached server side (gecko-cache).
• CSP: frame-src allows only https://www.geckoterminal.com (App Router keeps the first document's CSP, so it is set on every entry page).
• The native chart is restyled (segmented range and type controls, the change chip) and reads the hydration-safe account.
• The footer credits TradingView, as the lightweight-charts licence asks.

Notes

• The GeckoTerminal files (geckoterminal.ts, gecko-cache.ts, chart-pool.ts, the chart-provider route and their tests) are the same as in feat(charts): add Gecko advanced charts with on-chain fallback #43. If feat(charts): add Gecko advanced charts with on-chain fallback #43 lands first they drop out of this diff; if this stack lands, feat(charts): add Gecko advanced charts with on-chain fallback #43 can close.

Checks on this branch: lint, tsc --noEmit, npm test (889 pass, 0 fail, 10 skipped), next build.

Stack (merge top to bottom)

1. UI overhaul, phase 1: search everywhere, row-to-page morph, rolling live numbers #60 phase 1: search, row-to-page morph, live numbers
2. ui: home as a live floor (river, totals sentence, watchlist, just launched) #61 home as a live floor
3. ui: shared foundations for the overhaul (Geist type, chain marks, vendor kit) #64 shared foundations for the overhaul (Geist type, chain marks, vendor kit)
4. ui: rebuild the header nav #65 rebuild the header nav
5. feat(launch): optional creator banner, stored and edited like the logo #66 optional creator banner, stored and edited like the logo
6. ui: market board with cards and denser rows #67 market board with cards and denser rows
7. ui: home floor (hero, live river and bubbles, trending) #68 home floor (hero, live river and bubbles, trending)
8. feat(charts): GeckoTerminal chart with the native chart as fallback #69 GeckoTerminal chart with the native chart as fallback (this PR)
9. ui: token page hero, trade panel and details #70 token page hero, trade panel and details
10. ui: launch flow as a step rail with a live preview #71 launch flow as a step rail with a live preview
11. ui: posts, how it works, agents and dashboard in the new style #72 posts, how it works, agents and dashboard in the new style

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